Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca43ba0e18099a3df87a43fdd737747e2526e2a99fade80caf80484f30a7b39' 
  AND token = 'ScX9gajPjRJS9UY2CqUsQK7ye1nuyW/VCgfPKXGIt8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}